Joseph sack



(No Model.)

J, SACK. INDIVIDUAL TELEPHONE CALL. No. 423,575. Patented Mar. 18,1.890.

UNITED STATES PATENT OFFICE.

JOSEPH SACK, OF DUSSELDORF, GERMANY.

IN DIVIDUAL TELEPHON E-CALL.

SPECIFICATION forming part of Letters Patent No. 423,575, dated March18, 1890. Application filed May 1, 1889. Serial No. 309,207. (No model.)

To all whom it may concern.-

Be it known that I, JOSEPH SACK, of Dusseldorf, Germany, have inventedan Improved Individual Telephone-Call, of which the following is aspecification.

This invention has for its object to obtain an individual call ontelephone-wires with several stations at the desired call-room onlywithout molesting the others, and after the call is given to replaceautomatically the apparatus for the individual call into the standardposition.

The invention consists in the various features of improvement more fullypointed out in the claims.

In the accompanying drawings, Figure 1 is a side elevation of myimproved individual call; Fig. 2, a top view thereof, partly brokenaway; and Fig. 3, a plan of the circuit.

The letter it represents a toothed wheel mounted upon shaft 15,supported by two armed brackets t, afiixed to standard t The wheel I; isengaged by pawl r, acted upon by spring 0' 121/ is a stop, and m apointer secured to wheel 75.

w is a lever turning in bearing y and carrying a toothed segment 2, thatengages a toothed wheel on a vane z. The motion of lever w is confinedbetween the stops 2' 2 The lever 10 is provided with two ebonite piecesw 10 to prevent by the forward or backward motion of wheel is a metalliccontact of pointer m with lever w. The pointer m must touch in the firstmoment the ebonite piece w or w". Metallic contact between the saidparts can only be formed if the lever w, having been lifted by pointerm, falls back, with its metallic bodyresting upon the pointer. Thepointer m is connected by wheel k with battery B, while the lever to isconnected by bearing 1] with one end of the coil of the call-bell, theother end of the coil being connected with an insulated brass extension0 of telephone-lever c. The extension 0' is adapted to make contact withpesto, connected with the earth. This arrangement is necessary in orderto prevent the bell from sounding until wheel 7c,with pointer m, isreplaced to its normal position. The bell-circuit is closed when thetelephone is hooked on, because by that operation the rear arm of levercis lifted and put with its extension 0 against the post 0 .to establishcommunication with the earth. The bell-circuit is broken by the removalof the telephone, as when the rear arm of lever c is lowered with itsextension the communication between the post 0 and extension 0 isbroken.

In order to prevent the simultaneous establishment of contact betweenpointer m and lever 10, and thereby of the bell-circuit at the severalstations of the same wire, the pointer m or the bearer y is adj ustablyfastened. The vane z prevents the lever to from being lovered tooquickly, and the latter requires a few seconds for executing its motionimparted to it by the pointer m.

at is a clock-work, which has for its object to bring back into thenormal position the toothed wheel 76 at the several stations on the samewire by means of the pawl r and a spiral spring 02. For this purpose theclock-work is provided with the escape-wheel a, having one or more pinsa The pawl 0' has a stoppin 7' and a cam or similar device 7 The springn is placed upon the axis of Wheel 70. In the normal position the pin 0*is close to pm 10 and thereby arrests the wheel u and the clock-work.It, now, the wheel 7.: is moved forward one tooth,the pawl 0' becomesdisengaged, and is lowered, together with its pin 0', to liberate pin aThus the wheel a is released, and is free to be turned by the clockwork.During its revolution the wheel u slides with its pins 20 on cam r ofpawl r. The pawl is thereby lowered, and is momentarily disengaged torelease toothed wheel 70, which is brought back to its normal positionby spring 72.

The time for the revolution of wheel a amounts to, say, 0.5 of a minute,during which time every call-room may be rung up-that is to say, anycall-room of the rooms situated on the same wire or 011 two wiresconnected with each other at the exchange-oflice can be rung up in halfa minute. This time being passed, the pin a has left cam 7 the pawl 0'has re-engaged wheel 70, the pin '7" rearrests pin a and thus wheel aand the clock-work are stopped at the several stations on the sametelephonewvire, and the apparatuses for the individual call areautomatically and simultaneously brought back into their origi- "nalpositions. The individual call apparatus is under the influence of theelectro-1nagnet p, which effects the forward motion of wheel is by thearmature 0. To prevent the retention of the armature during its passagefrom one tooth to the other, its forward end is jointed, as shown. Thearm 0 is the armature of the electro-magnet 1), and is brought backagainst the stop-screw by a spiral spring as soon as the currenthas beenbroken. The wheel 70 is therefore not prevented from turning whenreleased by a depression of pawl r.

Fig. 3 shows the circuit of an intermediate station on a wire withseveral call-rooms by means of an automatic lever-switch. The latter isomitted at the terminal station, at which the wire is led directly tothe electromagnet 1). The switch-arm a being in its central posit-ion,the call-rooms are in the circuit. The current passes from wire L topost (Z, plate I), post g, electro-mag'net 1), post 9, plate I), postat, wire L, and thence to the terminal station.

The individual call of any one station, without interfering with theothers, operates as follows: By the current the armature 0 is attractedat all the stations. It gears into the teeth of wheel is and revolves itfor one' Together with wheel k there is re- 3 to be called) the pointeron will indeedpush one after another the ebonite piece w and lift leverin; but electrical contact cannot take place between lever in andpointer m, because the latter has been already moved away before lever20, which occupies, say, two seconds time for its motion, has fallenback. The bell-circuit cannot, therefore, be closed at rooms 1 and 2. Atroom 3 pointer m will, by the third emission of current, arrive at theebonite piece to, push it, and lift thereby lever 21'; but as pointer mcannot be In order At the rooms motion of wheel 70 the pawl '7' islowered, and

thereby leaves with its pin 7" the pin 10 Thus the wheel a is releasedand turned by the clock-work. After 0.5 of a minute has passed the pin alowers by sliding on cam r the ratchet r. The wheel is is released andbrought back into itsnormal positionby spring at automatically andsimultaneously at all stations, and without any disorder on the wire, asdescribed. At the conclusion of the conversation the telephone ishookedon (the switch arm a is brought back into its central position)and the room is replaced into the proper position on the wire.

hat I claim is- 1. The'co mbination of toothed wheel k,hav-

ing pointer m, with the arrest-pawl '1', motionimparting armature 0, andwith lever to, having ebonite pieces w 10 substantially as specified.

2. The combination of toothed wheel kyhaving pointer m, with lever 10,armature o,and with pawl r, having pin 1" and cam 7", and with wheel it,having pin a substantially as specified;

3. The combination of toothed wheel lahaving pointer 'm, with the pawlr, having pin 1" and cam r and with wheel a, having pin a and witharmature 0, and lever to, segment ,2, and vane 5, substantially asspecified.

In testimony whereof I have signed this specification in the presence-oftwo subscribing witnesses.

JOSEPH SACK.

\Vitnesses:

AUGUST v. PAPEN, THEODOR MAYER.

